<s>
The	O
Ricart	B-Operating_System
–	I-Operating_System
Agrawala	I-Operating_System
algorithm	I-Operating_System
is	O
an	O
algorithm	O
for	O
mutual	B-Operating_System
exclusion	I-Operating_System
on	O
a	O
distributed	B-Architecture
system	I-Architecture
.	O
</s>
<s>
This	O
algorithm	O
is	O
an	O
extension	O
and	O
optimization	O
of	O
Lamport	B-Operating_System
's	I-Operating_System
Distributed	I-Operating_System
Mutual	I-Operating_System
Exclusion	I-Operating_System
Algorithm	I-Operating_System
,	O
by	O
removing	O
the	O
need	O
for	O
messages	O
.	O
</s>
